/*gcc calc.c -o calc.out `pkg-config --cflags --libs gtk+-2.0`*/
#include <gtk/gtk.h>
#include <stdlib.h>
#include <math.h> 
// 全局输入框 
static GtkWidget *entry;
gint count = 0;

gdouble nn = 0; // 操作数一 
gdouble mm = 0;// 操作数 二 

gint s = 0; // 1 ++> +  2>>- 3>>* 4>> / 5>>sqrt 6>> pow 7>>1/x 
gboolean first = TRUE;
gboolean have_dot = FALSE; //  存在点 
gboolean have_result = FALSE;// 存在结果  
gchar number[100];

// 清除所有参数 
void clear_all()
{
    gint i;
    nn = 0;
    mm = 0;
    s = 0;
    count = 0;
    first = TRUE;
    have_dot = FALSE;
    have_result = FALSE;
    for (i = 0; i < sizeof(number); i++)
        number[i] = '\0';
    gtk_entry_set_text(GTK_ENTRY(entry), "");
}
void on_clear_clicked(GtkButton *button, gpointer data)
{
    clear_all();
}
// 按钮数据处理函数 
void on_num_clicked(GtkButton *button, gpointer data)
{
    const gchar *num;
    gint i;
    if (have_result) clear_all();
    if (count == 6) return; //限制运算位数 
    count++;
    // 获取按钮数据 
    num = gtk_button_get_label(GTK_BUTTON(button));
    // 连接函数 
    i = g_strlcat(number, num, 100);
    //  first 切换参数一 二开关 
    if (first) {
        nn = g_ascii_strtod(number, NULL);// 将字符串数组转为gdouble 数据类型 
    }
    else
        mm = g_ascii_strtod(number, NULL);//将字符串数组转为gdouble 数据类型  
    gtk_entry_set_text(GTK_ENTRY(entry), number);
}
void on_suan_clicked(GtkButton *button, gpointer data)
{
    gint i;
    s = GPOINTER_TO_INT(data);
    // 第二个 参数 
    first = FALSE;
    count = 0;
    have_dot = FALSE;
    gtk_entry_set_text(GTK_ENTRY(entry), "");
    // 清空缓存 
    for (i = 0; i < sizeof(number); i++)
        number[i] = '\0';
}
void on_dot_clicked(GtkButton *button, gpointer data)
{
    gint i;
    if (have_result) clear_all();// 存在结果 
    if (have_dot == FALSE) {
        have_dot = TRUE;
        i = g_strlcat(number, ".", 100);
        gtk_entry_set_text(GTK_ENTRY(entry), number);
    }
}
void on_eq_clicked(GtkButton *button, gpointer data)
{
    gdouble numb;
    gchar num[100];// 缓冲数组 
    gchar *result;
    switch(s) {
    case 1:
        numb = nn + mm;
        break;
    case 2:
        numb = nn - mm;
        break;
    case 3:
        numb = nn * mm;
        break;
    case 4:
        numb = sqrt(nn);
    case 5:
        numb = pow(nn,mm);
    case 6:
        numb = 1/(nn/mm);
    case 7:
        numb = nn % mm;
        break;
    }
    result = g_ascii_dtostr(num, 100, numb);
    have_result = TRUE;
    gtk_entry_set_text(GTK_ENTRY(entry), result);
}
/* 功能：  设置背景图
 * widget: 主窗口
 * w, h:   图片的大小
 * path：  图片路径
 */
void chang_background(GtkWidget *widget, int w, int h, const gchar *path){
	gtk_widget_set_app_paintable(widget, TRUE);		//允许窗口可以绘图
	gtk_widget_realize(widget);	
	/* 更改背景图时，图片会重叠
	 * 这时要手动调用下面的函数，让窗口绘图区域失效，产生窗口重绘制事件（即 expose 事件）。
	 */
	gtk_widget_queue_draw(widget);
 
	GdkPixbuf *src_pixbuf = gdk_pixbuf_new_from_file(path, NULL);	// 创建图片资源对象
	// w, h是指定图片的宽度和高度
	GdkPixbuf *dst_pixbuf = gdk_pixbuf_scale_simple(src_pixbuf, w, h, GDK_INTERP_BILINEAR);
 
	GdkPixmap *pixmap = NULL;
 
	/* 创建pixmap图像; 
	 * NULL：不需要蒙版; 
	 * 123： 0~255，透明到不透明
	 */
	gdk_pixbuf_render_pixmap_and_mask(dst_pixbuf, &pixmap, NULL, 128);
	// 通过pixmap给widget设置一张背景图，最后一个参数必须为: FASLE
	gdk_window_set_back_pixmap(widget->window, pixmap, FALSE);
	// 释放资源
	g_object_unref(src_pixbuf);
	g_object_unref(dst_pixbuf);
	g_object_unref(pixmap);
}
int main(int argc, char *argv[])
{
    GtkWidget *window;
    GtkWidget *vbox;
    GtkWidget *hbox, *hbox0,*hbox1, *hbox2, *hbox3, *hbox4;
    GtkWidget *button;
    gtk_init(&argc, &argv);
    
    window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
    // 保证窗口正常退出 
    g_signal_connect(G_OBJECT(window), "delete_event", G_CALLBACK(gtk_main_quit), NULL);
    // 设置背景图片 
    chang_background(window, 230, 300, "bj_image.png");
    
    gtk_window_set_title(GTK_WINDOW(window), "计算器");
    gtk_window_set_position(GTK_WINDOW(window), GTK_WIN_POS_CENTER);    //postion
    gtk_widget_set_usize (window, 230, 300);
    gtk_container_set_border_width(GTK_CONTAINER(window), 10);
    
    vbox = gtk_vbox_new(FALSE, 0);
    gtk_container_add(GTK_CONTAINER(window), vbox);
    // 输入框 
    entry = gtk_entry_new();
    // 设置文本 方向 
    gtk_widget_set_direction(entry, GTK_TEXT_DIR_RTL);
    gtk_box_pack_start(GTK_BOX(vbox), entry, FALSE, FALSE, 5);
    
    
    hbox = gtk_hbox_new(FALSE, 0);
    gtk_box_pack_start(GTK_BOX(vbox), hbox, FALSE, FALSE, 5);
    button = gtk_button_new_with_label("CE");
    gtk_box_pack_start(GTK_BOX(hbox), button, FALSE, FALSE, 5);
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_clear_clicked), NULL);
    
       
    hbox0 = gtk_hbox_new(FALSE, 0);
    gtk_box_pack_start(GTK_BOX(vbox), hbox0, TRUE, FALSE, 5);
    button = gtk_button_new_with_label(" sqrt");
    gtk_box_pack_start(GTK_BOX(hbox0), button, TRUE, FALSE, 5);
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_suan_clicked),  (gpointer)5);
     button = gtk_button_new_with_label("pow");
    gtk_box_pack_start(GTK_BOX(hbox0), button, TRUE, FALSE, 5);
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_suan_clicked),  (gpointer)6);
     button = gtk_button_new_with_label("1/X");
    gtk_box_pack_start(GTK_BOX(hbox0), button, TRUE, FALSE, 5);
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_suan_clicked),  (gpointer)7);
     button = gtk_button_new_with_label("  % ");
    gtk_box_pack_start(GTK_BOX(hbox0), button, TRUE, FALSE, 5);
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_suan_clicked),  (gpointer)8);
    
    
    
    hbox1 = gtk_hbox_new(FALSE, 0);
    gtk_box_pack_start(GTK_BOX(vbox), hbox1, FALSE, FALSE, 5);
    button = gtk_button_new_with_label("3");
    gtk_box_pack_start(GTK_BOX(hbox1), button, TRUE, TRUE, 5);
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_num_clicked), NULL);
    button = gtk_button_new_with_label("2");
    gtk_box_pack_start(GTK_BOX(hbox1), button, TRUE, TRUE, 5);
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_num_clicked), NULL);
    button = gtk_button_new_with_label("1");
    gtk_box_pack_start(GTK_BOX(hbox1), button, TRUE, TRUE, 5);
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_num_clicked), NULL);
    button = gtk_button_new_with_label("+");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_suan_clicked), (gpointer)1);
    gtk_box_pack_start(GTK_BOX(hbox1), button, TRUE, TRUE, 5);
    
    hbox2 = gtk_hbox_new(FALSE, 0);
    gtk_box_pack_start(GTK_BOX(vbox), hbox2, FALSE, FALSE, 5);
    button = gtk_button_new_with_label("6");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_num_clicked), NULL);
    gtk_box_pack_start(GTK_BOX(hbox2), button, TRUE, TRUE, 5);
    button = gtk_button_new_with_label("5");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_num_clicked), NULL);
    gtk_box_pack_start(GTK_BOX(hbox2), button, TRUE, TRUE, 5);
    button = gtk_button_new_with_label("4");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_num_clicked), NULL);
    gtk_box_pack_start(GTK_BOX(hbox2), button, TRUE, TRUE, 5);
    button = gtk_button_new_with_label("-");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_suan_clicked), (gpointer)2);
    gtk_box_pack_start(GTK_BOX(hbox2), button, TRUE, TRUE, 5);
    
    hbox3 = gtk_hbox_new(FALSE, 0);
    gtk_box_pack_start(GTK_BOX(vbox), hbox3, FALSE, FALSE, 5);
    button = gtk_button_new_with_label("9");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_num_clicked), NULL);
    gtk_box_pack_start(GTK_BOX(hbox3), button, TRUE, TRUE, 5);
    button = gtk_button_new_with_label("8");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_num_clicked), NULL);
    gtk_box_pack_start(GTK_BOX(hbox3), button, TRUE, TRUE, 5);
    button = gtk_button_new_with_label("7");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_num_clicked), NULL);
    gtk_box_pack_start(GTK_BOX(hbox3), button, TRUE, TRUE, 5);
    button = gtk_button_new_with_label("*");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_suan_clicked), (gpointer)3);
    gtk_box_pack_start(GTK_BOX(hbox3), button, TRUE, TRUE, 5);
    
    hbox4 = gtk_hbox_new(FALSE, 0);
    gtk_box_pack_start(GTK_BOX(vbox), hbox4, FALSE, FALSE, 5);
    button = gtk_button_new_with_label("0");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_num_clicked), NULL);
    gtk_box_pack_start(GTK_BOX(hbox4), button, TRUE, TRUE, 5);
    button = gtk_button_new_with_label(".");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_dot_clicked), NULL);
    gtk_box_pack_start(GTK_BOX(hbox4), button, TRUE, TRUE, 5);
    button = gtk_button_new_with_label("=");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_eq_clicked), NULL);
    gtk_box_pack_start(GTK_BOX(hbox4), button, TRUE, TRUE, 5);
    button = gtk_button_new_with_label("/");
    g_signal_connect(G_OBJECT(button), "clicked", G_CALLBACK(on_suan_clicked), (gpointer)4);
    gtk_box_pack_start(GTK_BOX(hbox4), button, TRUE, TRUE, 5);
    // 显示 
    gtk_widget_show_all(window);
    // 主事件循环 
    gtk_main();
    return TRUE;
}
